HELP PLEASE IT'S TIMED I'LL MAKE YOU BRAINLIEST This diagram shows a segment of a roller coaster. As the roller coaster car moves from Point A to Point B, its speed increases.

Which statement explains why the speed increases?

A.

The force of friction decreases on the downhill track.

B.

The inertia of the roller coaster car decreases.

C.

Balanced forces act on the roller coaster car.

D.

Unbalanced forces act on the roller coaster car.

Simple machines can a. increase force only b. decrease force only c. increase or decrease force

Suppose water is leaking from a tank through a circular hole of area ah at its bottom. when water leaks through a hole, friction and contraction of the stream near the hole reduce the volume of water leaving the tank per second to cah 2gh , where c (0 < c < 1) is an empirical constant. a tank in the form of a right-circular cone standing on end, vertex down, is leaking water through a circular hole in its bottom. (assume the removed apex of the cone is of negligible height and volume.) (a) suppose the tank is 20 feet high and has radius 8 feet and the circular hole has radius 2 inches. the differential equation governing the height h in feet of water leaking from a tank after t seconds is dh dt = − 5 6h3/2 . if the height of the water is initially 8 feet, how long will it take the tank to empty? (round your answer to two decimal places.)

Tafari worked one summer on a ship that set weather buoys in the ocean. he watched how one of the buoys moved in the water. describe which parts of the wave would cause the buoy to bob up and down. which wave property determined how fast the buoys bobbed in the water? he observed that when the wind blew harder, the ocean waves were larger, and the buoys moved away from the ship. what effect, if any, did the waves have on how far the buoys moved? explain your answer.